
Configuring WAN Line Services
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Figure 4-2. Remote Digital Loopback (CCITT V.54 Loopback)
Local Analog Loopback (AL)
Local Analog Loopback is a self-diagnostic local test (Figure 4-3
).
Figure 4-3. Local Analog Loopback
During the local loop test, the CSU transmits data to the network to avoid causing
a carrier alarm.
Network
AN/ANH/ARN
DSU
CSU
LS0024A
Network
AN/ANH/ARN
DSU
CSU
LS0023A
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